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Finding the Fourth Proportional to 1,400.82, 2,099.86 and 783.28

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Solution

The fourth proportional to 1,400.82, 2,099.86 and 783.28 is: 1,174.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,400.82 : 2,099.86 = 783.28 : x
  2. Step 2: Convert to fraction form
    1,400.82/2,099.86 = 783.28/x
  3. Step 3: Cross multiply
    1,400.82x = 2,099.86 × 783.28
  4. Step 4: Simplify right side
    1,400.82x = 1,644,771.98
  5. Step 5: Solve for x
    x = 1,644,771.98/1,400.82
  6. Step 6: Final answer
    x = 1,174.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.